Commitments And Contingencies (Schedule Of Environmental Liabilities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Site Contingency [Line Items]
Environmental liabilities	$ 2,654	$ 2,811
Newark, New Jersey And Vasset, France [Member]
Site Contingency [Line Items]
Environmental liabilities	1,361	1,492
Joplin, Missouri [Member]
Site Contingency [Line Items]
Environmental liabilities	$ 1,293	$ 1,319

Estimated undiscounted amount of the accrual for the environmental loss contingencies at an individual site as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 96-1

-Paragraph 132, 161, 163

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Name:	us-gaap_SiteContingencyAccrualUndiscountedAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant